For example they make gum disease a lot worse (which then in turn is linked to Alzheimer's for example) https://onlinelibrary.wiley.com/doi/abs/10.1034/j.1600-051x....
Note that there is a ton of other HSV-*, for example HSV-6 https://hhv-6foundation.org/what-is-hhv-6 I think there is just not enough research yet on what is caused or made worse by which herpes virus.